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WorksheetsIntake sensors test
Total questions: 50
Worksheet time: 25mins
What does MAP stand for in the context of engine sensors?
Manifold Absolute Pressure
Mass Airflow Pressure
Mechanical Air Pump
Metered Air Pressure
What is the main function of a MAP sensor in fuel-injected engines?
To monitor the air pressure inside the intake manifold.
To regulate the fuel pump pressure.
To control the ignition timing directly.
To measure the temperature of the exhaust gases.
MAP sensors typically use a piezoelectric or capacitive pressure sensor.
True
False
What happens inside a MAP sensor when there is a change in pressure?
A diaphragm inside the sensor flexes with changes in pressure.
The sensor emits a spark to indicate pressure change.
A liquid inside the sensor evaporates.
The sensor rotates to adjust to the new pressure.
Which of the following tools is needed to test a MAP sensor?
Digital Multimeter (DMM)
Handheld vacuum pump (optional)
Scan tool (for live data)
All of the above
When using a scan tool for live data, what should the MAP reading be compared with when the key is on and the engine is off?
Barometric pressure
Engine vacuum
Coolant temperature
Battery voltage
In the Vacuum Test, what should happen to the voltage as vacuum increases?
Voltage should drop as vacuum increases.
Voltage should rise as vacuum increases.
Voltage should remain constant as vacuum increases.
Voltage should fluctuate randomly as vacuum increases.
If there is no voltage change during the vacuum test, the MAP sensor is functioning correctly.
True
False
What voltage would you expect at idle on an analog MAP sensor?
Around 1.0 to 1.5 volts.
Around 4.5 to 5.0 volts.
Around 2.5 to 3.0 volts.
Zero volts.
What are signs of a failing MAP sensor?
Rough idle, poor fuel economy, black smoke, CEL on.
Smooth idle, improved fuel economy, no smoke, CEL off.
High-pitched engine noise, increased horsepower, blue smoke.
Engine overheating, coolant leak, white smoke from exhaust.
Fill in the blank: Electronic Throttle Control (ETC) integrates with other systems such as ________, traction control, and stability control.
cruise control
air conditioning
power windows
headlights
What is the main function of the Accelerator Pedal Position Sensor (APP)?
Controls airflow into the engine
Detects driver input (pedal movement)
Opens/closes the throttle plate
Interprets sensor signals
What does the Throttle Plate control?
Fuel injection
Airflow into the engine
Emissions
Pedal movement
What is the function of the Throttle Actuator Motor?
Detects driver input
Reports throttle plate angle
Opens/closes the throttle plate
Interprets sensor signals
How does the Electronic Throttle Control (ETC) system work? What does the TPS do in the ETC system?
TPS confirms plate position and ECM adjusts as needed.
TPS directly controls the fuel injectors in the ETC system.
TPS opens and closes the throttle plate mechanically.
TPS sends signals to the ignition coil to adjust timing.
Which of the following is a safety feature of the ETC system?
Only one APP sensor is used
Limp Mode (Fail-Safe)
No self-diagnostics
No redundant sensors
Which sensors are used redundantly in the ETC system for accuracy?
Two APP sensors and two TPS sensors
One APP sensor and one TPS sensor
Two MAP sensors and one TPS sensor
One ECT sensor and one TPS sensor
What is one key advantage of Electronic Throttle Control (ETC)?
Improved integration with modern systems
Increased mechanical linkage
More wear and tear
Less precise fuel management
Which of the following is a benefit of ETC?
Less precise fuel and air management
More precise fuel and air management
Increased mechanical linkage
More wear
According to the study tip, what does ETC stand for and how does it work?
ETC stands for 'Drive-by-Wire.' The pedal sends an electronic signal, not a direct cable pull.
ETC stands for 'Electronic Traction Control.' It uses hydraulic pressure to control speed.
ETC stands for 'Engine Timing Control.' It adjusts the timing belt electronically.
ETC stands for 'Emergency Transmission Cutoff.' It disconnects the transmission in emergencies.
Where is the Throttle Position Sensor (TPS) mounted?
On the throttle body.
On the fuel injector.
On the air filter.
On the exhaust manifold.
The TPS is attached to the throttle shaft so it rotates as the throttle plate moves.
True
False
The TPS is usually a ________ or a non-contact Hall-effect sensor.
potentiometer (variable resistor)
thermistor
photoresistor
inductor
Which of the following is NOT a component of the TPS?
Reference Voltage Input
Ground Circuit
Signal Output
Fuel Injector
The Reference Voltage Input to the TPS is typically how many volts from the ECM?
5V
12V
3.3V
9V
The Signal Output of the TPS returns voltage to the ECM based on what?
Throttle position
Engine temperature
Fuel pressure
Battery voltage
What is the signal voltage for a closed throttle?
Around 0.5V
Around 2.5V
Around 4.5V
Around 1.5V
What is the signal voltage for a Wide Open Throttle (WOT)?
Around 0.5V
Around 2.5V
Around 4.5V
Around 1.5V
The signal must rise smoothly as the throttle opens.
True
False
Which sensors does the engine management system work together with?
Mass Air Flow (MAF) or Manifold Absolute Pressure (MAP) sensor
Intake Air Temperature (IAT) sensor
Oxygen sensors
All of the above
During a visual inspection when testing the TPS, what should you check for?
Check wiring, connector corrosion, or loose mounting.
Check for fuel leaks around the throttle body.
Inspect the color of the engine oil.
Check the tire pressure.
When performing a voltage test on the TPS, the voltage should increase smoothly from approximately 0.5V to 4.5V as the throttle is opened.
True
False
When using a scan tool to test the TPS, what should the throttle angle percentage read at closed throttle and at WOT (Wide Open Throttle)?
Near 0% at closed throttle, near 100% at WOT.
Near 50% at closed throttle, near 50% at WOT.
Near 100% at closed throttle, near 0% at WOT.
Near 25% at closed throttle, near 75% at WOT.
What should you check for during a resistance test on older potentiometer type TPS?
Check for smooth resistance change when moving throttle. No jumps or open spots.
Check for voltage drop across the battery terminals.
Check for continuity between ground and signal wires at all times.
Check for a constant resistance value regardless of throttle position.
Some TPS are adjustable and must be set to the proper base voltage.
True
False
Fill in the blank: A ________ is a variable resistor used in many TPS designs.
Potentiometer
Transistor
Capacitor
Inductor
Fill in the blank: The ECM/PCM stands for Engine/Powertrain ________ Module, the computer that receives TPS signals.
Control
Command
Communication
Compressor
What is the main purpose of the Intake Air Temperature (IAT) sensor?
Measures the pressure of the incoming air
Measures the temperature of the incoming air entering the engine
Measures the speed of the engine
Measures the fuel level
The IAT sensor provides data to the Engine Control Module (ECM/PCM) to help calculate which of the following?
Air density
Fuel delivery
Ignition timing
All of the above
Where is the IAT sensor usually located?
In the fuel tank
In the air intake duct, air filter housing, or integrated with the Mass Air Flow (MAF) sensor
On the dashboard
In the exhaust pipe
Fill in the blank: The IAT sensor is usually a ______ type sensor (usually Negative Temperature Coefficient – NTC).
Thermistor
Photodiode
Piezoelectric
Hall effect
A two-wire IAT sensor consists of which two wires?
Power wire and ground wire
Signal wire to ECM and ground wire
Signal wire to battery and power wire
Ground wire and power wire
Fill in the blank: Cold air = high resistance = ______ voltage signal to ECM.
low
high
medium
fluctuating
Fill in the blank: Warm air = low resistance = ______ voltage signal to ECM.
higher
lower
constant
zero
Colder air is denser and needs more fuel, so the air-fuel ratio is adjusted accordingly.
True
False
The IAT sensor helps with ______ timing (colder air requires more spark advance).
ignition
fuel
valve
camshaft
Which of the following is a symptom of a faulty IAT sensor?
Hard starting (especially in cold weather)
Fast acceleration
Smooth idle
Improved fuel economy
How does the ECU utilise the data from the MAF sensor?
To adjust the ignition timing.
To control the operation of the EGR valve.
To calculate the correct amount of fuel to inject.
To monitor the coolant temperature.
Describe the construction and operation of a hot wire MAF sensor.
It uses a bimetallic strip that bends in response to airflow.
It uses a small turbine that spins at a speed proportional to airflow.
It uses a heated wire that is cooled by the airflow, and the current needed to maintain its temperature is measured.
It uses a pressure sensor to measure the difference in pressure across a restriction.
List some symptoms of a defective MAF sensor.
Poor fuel economy, hesitation on acceleration, rough idling, stalling.
Overheating, loss of coolant, white smoke from the exhaust.
Excessive oil consumption, blue smoke from the exhaust.
Brake fluid leak, spongy brake pedal.
